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Aristotle thought that all matter was made of earth,air,water,and fire. This created the platform for future scientists and philosophers.
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Gave the idea that atoms are invisible
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John Dalton proposed five ideas to the world of science. 1, All matter is made of invisible particals,2.All atoms of the same element are the same,3 Atoms of different elements are different,4 Elements combine together insmall whole number ratios,5 Atoms are small hard spheres
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discoverd that rays emitted by uranium differ from an x-ray. They also could not be detected by electro magnetic fields.
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He discovered the electron. He discoverd the electron by using the plum pudding model.
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Rutherford used a gold foil experiment. He shot a positively charged beam of particals through a gold foil sheet. If the particals were soft it would conclude J.J Thompsons plum pudding model was true.
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Found the charge and mass of the electron. Millikan used his oil drop experiment.
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Bohr proposed the idea that electrons travel around the nucleous in a definite path.
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James Chadwick discoverd the neutron.
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Discovered radioactivity and the elements Polonium and Radium.
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The current day model of an atom is based on the quantum theory.
